"Install blueman sudo apt install blueman
Delete the paired device in the bluetooth settings.
Run these commands in terminal: bash
sudo pkill pulseaudio
sudo /etc/init.d/bluetooth restart
Turn off headphones.
Turn on headphones, and press green/go until headphones notification voice says "Ready to pair."
Launch blueman, and from the upper right menu, right-click the icon to bring up the blueman menu. Select Setup new device.
Pair the device, and when you are given an option, not headphones, not handsfree. Use the Audio sink option.
Then when you look into the audio settings panel, the device should be displayed."

In my case, the situation is more like killing pulseaudio, restarting the bluetooth service, and reconnecting to the device using Blueman as an audio sink, NOT using the GNOME Bluetooth applet.

If I do this, the device appears as a sound device and works....until I reboot the computer.

I was told to file a bug on this by the #ubuntu-gnome IRC channel using ubuntu-bug audio.

- [VIZIO SB3820, playback] Playback problem, Device not listed in Sound- and can't be used without workarounds.+ [VIZIO SB3820, playback] Bluetooth speaker not listed in Sound and can't+ be used without workarounds.